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Co 9 S 8 /Co as a High‐Performance Anode for Sodium‐Ion Batteries with an Ether‐Based Electrolyte
Author(s) -
Zhao Yingying,
Pang Qiang,
Wei Yingjin,
Wei Luyao,
Ju Yanming,
Zou Bo,
Gao Yu,
Chen Gang
Publication year - 2017
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201701334
Subject(s) - overpotential , electrolyte , electrochemistry , anode , materials science , inorganic chemistry , sodium , chemical engineering , electrode , chemistry , metallurgy , engineering
Co 9 S 8 has been regarded as a desirable anode material for sodium‐ion batteries because of its high theoretical capacity. In this study, a Co 9 S 8 anode material containing 5.5 wt % Co (Co 9 S 8 /Co) was prepared by a solid‐state reaction. The electrochemical properties of the material were studied in carbonate and ether‐based electrolytes (EBE). The results showed that the material had a longer cycle life and better rate capability in EBE. This excellent electrochemical performance was attributed to a low apparent activation energy and a low overpotential for Na deposition in EBE, which improved the electrode kinetic properties. Furthermore, EBE suppressed side reactions of the electrode and electrolyte, which avoided the formation of a solid electrolyte interphase film.